+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103220 Kwongchuikuen (1999 YQ4) Classification: Main-belt Asteroid          SPK-ID: 2103220 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .190143393620592 4.7507e-08   a 2.674477981372377 1.5032e-08 au q 2.165943661830682 1.319e-07 au i 9.887137075426079 4.9834e-06 deg node 305.2248913143467 2.6356e-05 deg peri 162.9301396548882 3.0094e-05 deg M 284.8488058416664 1.712e-05 deg tp 2459533.995787210800 (2021-Nov-15.49578721) 7.7809e-05 TDB period 1597.55922364907 4.37 1.3469e-05 3.688e-08 d yr n .2253437585729716 1.8999e-09 deg/d Q 3.183012300914071 1.7891e-08 au   Orbit Determination Parameters    # obs. used (total)      724      data-arc span      7729 days (21.16 yr)      first obs. used      1999-11-16      last obs. used      2021-01-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55181      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:44   Additional Information  Earth MOID = 1.1845 au   Jupiter MOID = 1.94818 au   T_jup = 3.332  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.25   n/a E2021B55   103220 Kwongchuikuen           Discovered 1999 Dec. 28 by W. K. Y. Yeung at Rock Finder Observatory. Kwong Chui Kuen (b. 1960), a producer of documentaries for television, is the wife of the discoverer. This is the chronologically earliest minor planet credited to the discoverer. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20080618/MPCPages.arc Last Updated: 2008-06-20 [ show close-approach data ] Alternate Designations  1999 YQ4 = 2002 PC21  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-28 20:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin